Remove check for class_name and extends order

Closes #31056

modules/gdscript/gdscript_parser.cpp

@@ -3366,7 +3366,7 @@ void GDScriptParser::_parse_extends(ClassNode *p_class) {
 		return;
 	}
 
-	if (!p_class->constant_expressions.empty() || !p_class->subclasses.empty() || !p_class->functions.empty() || !p_class->variables.empty() || p_class->classname_used) {
+	if (!p_class->constant_expressions.empty() || !p_class->subclasses.empty() || !p_class->functions.empty() || !p_class->variables.empty()) {
 
 		_set_error("\"extends\" must be used before anything else.");
 		return;